/* Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.activiti.explorer.ui.management.identity;

import com.vaadin.data.Item;
import com.vaadin.data.Property;
import com.vaadin.data.Property.ValueChangeEvent;
import com.vaadin.ui.Table;
import org.activiti.explorer.ExplorerApp;
import org.activiti.explorer.data.LazyLoadingContainer;
import org.activiti.explorer.data.LazyLoadingQuery;
import org.activiti.explorer.navigation.GroupNavigator;
import org.activiti.explorer.navigation.UriFragment;
import org.activiti.explorer.ui.Images;
import org.activiti.explorer.ui.management.ManagementPage;
import org.activiti.explorer.ui.util.ThemeImageColumnGenerator;

/**
 * Page for managing groups.
 *
 * @author Joram Barrez
 */
public class GroupPage extends ManagementPage {

    private static final long serialVersionUID = 1L;
    protected String groupId;
    protected Table groupTable;
    protected LazyLoadingQuery groupListQuery;
    protected LazyLoadingContainer groupListContainer;

    public GroupPage() {
        ExplorerApp.get().setCurrentUriFragment(
                new UriFragment(GroupNavigator.GROUP_URI_PART));
    }

    public GroupPage(String groupId) {
        this.groupId = groupId;
    }

    @Override
    protected void initUi() {
        super.initUi();

        if (groupId == null) {
            selectElement(0);
        } else {
            selectElement(groupListContainer.getIndexForObjectId(groupId));
        }
    }

    protected Table createList() {
        groupTable = new Table();

        groupTable.setEditable(false);
        groupTable.setImmediate(true);
        groupTable.setSelectable(true);
        groupTable.setNullSelectionAllowed(false);
        groupTable.setSortDisabled(true);
        groupTable.setSizeFull();

        groupListQuery = new GroupListQuery();
        groupListContainer = new LazyLoadingContainer(groupListQuery, 30);
        groupTable.setContainerDataSource(groupListContainer);

        // Column headers
        groupTable.addGeneratedColumn("icon", new ThemeImageColumnGenerator(Images.GROUP_22));
        groupTable.setColumnWidth("icon", 22);
        groupTable.addContainerProperty("name", String.class, null);
        groupTable.setColumnHeaderMode(Table.COLUMN_HEADER_MODE_HIDDEN);

        // Listener to change right panel when clicked on a user
        groupTable.addListener(new Property.ValueChangeListener() {
            private static final long serialVersionUID = 1L;

            public void valueChange(ValueChangeEvent event) {
                Item item = groupTable.getItem(event.getProperty().getValue()); // the value of the property is the itemId of the table entry
                if (item != null) {
                    String groupId = (String) item.getItemProperty("id").getValue();
                    setDetailComponent(new GroupDetailPanel(GroupPage.this, groupId));

                    // Update URL
                    ExplorerApp.get().setCurrentUriFragment(
                            new UriFragment(GroupNavigator.GROUP_URI_PART, groupId));
                } else {
                    // Nothing is selected
                    setDetailComponent(null);
                    ExplorerApp.get().setCurrentUriFragment(new UriFragment(GroupNavigator.GROUP_URI_PART, groupId));
                }
            }
        });

        return groupTable;
    }

    public void notifyGroupChanged(String groupId) {
        // Clear cache
        groupTable.removeAllItems();
        groupListContainer.removeAllItems();

        // select changed group
        groupTable.select(groupListContainer.getIndexForObjectId(groupId));
    }

}
